Hmm, I guess that would depend on a couple different factors. How much you can get for your Swift, how much you can get the Acer for, and if you are willing to trade pixel response time/motion clarity (Swifts 1ms vs Acers 4ms) for Color and viewing angles.
There are a couple other things to consider, too. The Acer can only do ULMB at 100hz or 85hz, while the Swift can do ULMB at 120hz... pretty cool feature for motion clarity in FPSs such as CS:GO. The Acer also has been known to have some IPS glow issues (it's like a yellowish glow in the bottom right of the screen particularly noticeable in dark scenes) while the Swift is supposed to be fantastic with backlight bleed.
All that said, I own the xb270hu and it's awesome. Mine does have a fair amount of IPS glow, but that is my only complaint. The colors are fantastic. I've never owned or have seen a ROG Swift, so I can't directly compare them, but it does seem like more of an instance of trade-offs than one being downright BETTER than the other.